Abstract: A method of fuel injection for an internal combustion engine having one or more combustion chambers and wherein a metered individual quantity of fuel entrained in a gas charge is injected individually by the pressure of the gas directly into each combustion chamber each combustion cycle thereof. The method including the steps of delivering gas from at least one combustion chamber of the engine to a common gas reservoir, and controlling said delivery of gas to the gas reservoir to substantially maintain the gas therein at a pressure above the maximum compression pressure in the combustion chamber prior to commencement of combustion in said combustion chamber. Supplying gas at a regulated pressure from said gas reservoir to receive the metered quantity of fuel and effect in sequence delivery of that fuel into the respective combustion chambers of the engine.

Abstract: A fuel metering and injection system for an internal combustion engine circulates fuel through a metering chamber (11) via valved fuel inlet and fuel outlet ports (25, 26) to prepare a metered quantity of fuel. Compressed gas is introduced into the metering chamber through a valved air inlet port (14) to displace the metered fuel and deliver it to the engine. Phasing of the valves is controlled to ensure that the fuel inlet and outlet valves (60, 61) are closed prior to opening of the air inlet valve (16), and that on completion of the injection phase residual gas in the metering chamber (11) is expelled through the fuel outlet port (26).

Abstract: A fuel injection method and apparatus for in-cylinder injection in an internal combustion engine. Compressed air is used to inject the fuel through an injection nozzle (43) particularly shaped so that different fuel spray patterns are produced at high and low fueling rates. At higher rates of fueling corresponding to higher engine loads the fuel spray pattern is narrower and penetrates further into the cylinder volume whereas at lower rates of fueling corresponding to lower engine loads the fuel spray pattern is wider, less penetrating and relatively more confined. By appropriate selection of nozzle shape the spatial distribution of the fuel spray droplets can be made to vary favorably over a range of engine loads.

Abstract: A fuel metering apparatus having a metering chamber to hold fuel for subsequent delivery to an engine. A rigid metering member projecting into the chamber linearly movable relative to the chamber to vary the extent of projection of the metering member into the chamber to thereby control the quantity of fuel displaceable from the chamber. An inextensible flexible member secured to the metering member and a motor operated in accordance with the engine fuel demand, the motion of the motor being transmitted to the metering member through the inextensible flexible member. The inextensible flexible member is preferably adjustably coupled to the motor so the limit of movement of the metering member may be set as required.

Abstract: A method and apparatus for injecting fuel into a combustion chamber of an internal combustion engine particularly of two stroke cycle spark ignited engine, wherein a metered quantity of fuel is entrained in a gas, and the fuel and gas mixture so formed is delivered through a nozzle into the combustion chamber under conditions that will establish a fuel spray having a dispersion velocity in the direction of the spray axis of not more than 25 meters/sec at 35 millimeters of spray penetration from the nozzle when measured in still air atmospheric pressure, and preferably that dispersion velocity is not more than 18 meters/sec at 70 millimeters from the nozzle.

Abstract: A method of delivering fuel to an internal combustion engine comprising delivering individual metered quantities of fuel into a conduit, and propelling each individual metered quantity of fuel along the conduit by an individual gas pulse. During the time interval between the respective gas pulses that deliver the metered quantities of fuel there is established a secondary gas flow in the conduit so as to limit variations in the quantity of fuel retained in the conduit as the metered quantity of fuel varies with engine fuel demand.

Abstract: Method and apparatus for fuel injection to an internal combustion engine is disclosed. Gas is supplied to a fuel holding chamber to maintain a reference pressure which is above atmospheric pressure in the fuel holding chamber. A metered quantity of fuel is delivered into the holding chamber against the reference pressure. Communication is established between the holding chamber and the engine, and the supply of gas to the holding chamber is maintained while the communication exists so the pressure of the gas is sufficient to displace the metered quantity of fuel from the holding chamber to the engine.

Abstract: A fuel injection apparatus for an internal combustion engine comprising a metering device to adjust the quantity of fuel delivered each cycle of the device in response to conditions in the engine induction passage, a control activating said device to effect a base number of delivery cycles to the engine, and a sensor responsive to transient engine conditions to increase the number of cycles of the metering device above the base number per engine revolution.

Abstract: The fuel injection apparatus includes fuel a fuel metering chamber, an air supply chamber and a further chamber formed in a rigid body. A metering member is slidable within the fuel and gas chambers and passes through the further chamber. The amount of fuel fed to the metering chamber via valve means is controlled by the position of the metering member. An increase in pressure in the air supply chamber opens a valved passage in the metering member and the air expels the fuel from the metering chamber via check valve means. The further chamber collects any leakage of air or fuel past bearing means that receives the metering member.

Abstract: In combination with an internal combustion engine having a crankcase in which an air/oil mist mixture exists during normal operation of the engine, a pump having a crankshaft journalled in a crankcase, a cylinder, a piston coupled to said crankshaft to reciprocate in the cylinder, an intake and a return passage each communicating the pump crankcase with said engine compartment, and one-way valves in each of said passages arranged so that reciprocation of the pump piston will circulate the air/oil mist mixture from the engine compartment through the pump crankcase to provide lubrication to the compressor crankshaft and piston.

Abstract: A liquid fuel supply for an internal combustion engine wherein the fuel is circulated in a closed circuit including a fuel reservoir and a fuel metering device, delivering the fuel from the metering device to the engine by admitting compressed air to the metering device, the compressed air being supplied by a compressor that draws air and fuel vapor from the fuel reservoir. The residual gas in the metering device being entrained in the circulating fuel and returned to the fuel reservoir.

Abstract: A method and apparatus for delivering metered quantities of liquid wherein the liquid is circulated through a chamber to fill the chamber with liquid and circulation is temporarily terminated with the chamber filled with liquid. While circulation is terminated gas under pressure is admitted to the chamber to displace liquid therefrom through a discharge port. The quantity of liquid displaced is controlled by regulating the volume of the chamber and/or by regulating the relative disposition in the chamber of the point of entry of the gas and point of discharge of the liquid.